underlying slopper

An underlying slopper is the act of a girl smearing her boyfriend's diarrhea on his balls and then using said diarrhea as lube to give him a handjob.

Man, I just got an underlying slopper from my girlfriend. It was fucking arousing and awesome!

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Underline Slopper

Carl: "Yo Stewie, how was your date with Andessa?"
Stewie: "You wont believe me, she gave me the best Underline Slopper ever"

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